Q.
In the cross performed by Morgan on Drosophila between yellow-bodied, white-eyed females and brown-bodied, red-eyed males it was observed in F2 generation that the percentage of progenies having parental characters was 98.7% and the percentage of progenies having recombinant characters is 1.3%. What can we conclude from this cross?
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a
The genes for eye colour and body colour are located on different chromosomes and do not show linkage.
b
The genes for eye colour and body colour are located on the same chromosome and show complete linkage.
c
The genes for eye colour and body colour are located on the same chromosome and are tightly linked.
d
The genes for eye colour and body colour are located on the same chromosome and are very loosely linked.
answer is C.
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Detailed Solution
In the cross performed by Morgan on Drosophila between yellow-bodied, white-eyed females and brown-bodied, red-eyed males it was observed in F2 generation that the percentage of progenies having parental characters was 98.7% and the percentage of progenies having recombinant characters is 1.3%. Morgan and his group also found that when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination). Hence, we can say that the genes for eye colour and body colour and body colour are located on same chromosome and are tightly linked.
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